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Iroquois County was created on February 26, 1833 out of a portion of Vermilion County. It was named for the Iroquois River, which was itself named for the Iroquois people.[4][5] The first county seat was established at the town of Iroquois in 1837, though no official buildings were constructed there and offices were rented. Several other sites for the county seat were examined, and in 1839 it was moved to Middleport; a court house and jail were built there. There was a long battle between Middleport and Watseka (also known as South Middleport) as to which should be the county seat; in 1865, it was finally moved to Watseka.[6] The town of Middleport no longer exists, but there is a township of that name. A courthouse was built in Watseka in 1866 at a cost of $28,000 and included a jail in the basement; this building was expanded in 1881, and a new jail was built in 1893 just east of the courthouse.[7]

Iroquois County from the time of its creation to 1836

Iroquois County between 1836 and 1853

Iroquois County in 1853, when the creation of Kankakee County reduced it to its current size.

According to the U.S. Census Bureau, the county has a total area of 1,119 square miles (2,900 km2), of which 1,117 square miles (2,890 km2) is land and 1.6 square miles (4.1 km2) (0.1%) is water.[8] It is the third-largest county in Illinois by land area[2] and the fifth-largest by total area.

The northern border of the county is about 60 miles (97 km) south of the city of Chicago. The county is bordered on the east by the state of Indiana and its counties of Benton and Newton. To the north lies Kankakee County. Vermilion County, out of which Iroquois County was originally formed, lies to the south. To the west is Ford County.

The Iroquois River enters the county from Indiana and flows westward along the south side of the village of Iroquois, then along the north side of the city of Watseka, whereupon it veers to the north and joins the larger Kankakee River near the city of Kankakee in the county of the same name; the Kankakee River then flows into the Illinois River further to the northwest in Will County. Sugar Creek, further to the south, also flows from the east to the west, entering from Indiana east of Stockland; it passes through the south edge of Milford, is joined by Mud Creek coming up from the south, and winds to the north past the village of Woodland and meets the Iroquois River near Watseka.

The Iroquois County State Wildlife Area, a 2,400-acre (970 ha) state park, is located in the northeast corner of the county. There are also three nature preserves: Bonnie's Prairie,[9] Hooper Branch Savanna,[10] and Loda Cemetery Prairie.[11]

In recent years, average temperatures in the county seat of Watseka have ranged from a low of 14 °F (−10 °C) in January to a high of 84 °F (29 °C) in July, although a record low of −28 °F (−33 °C) was recorded in January 1999 and a record high of 105 °F (41 °C) was recorded in August 1988. Average monthly precipitation ranged from 1.61 inches (41 mm) in January to 4.62 inches (117 mm) in June.[12]

Interstate 57 passes through the west part of the county on its route between Champaign and Chicago. From north to south, it passes through or near Chebanse, Clifton, Ashkum, Danforth, Gilman, Onarga, Buckley, and Loda.

The county is bisected by the east–west U.S. Route 24, which passes through Gilman, Crescent City, the county seat of Watseka, and Sheldon.

As of the 2010 United States Census, there were 29,718 people, 11,956 households, and 8,175 families residing in the county.[19] The population density was 26.6 inhabitants per square mile (10.3/km2). There were 13,452 housing units at an average density of 12.0 per square mile (4.6/km2).[8] The racial makeup of the county was 94.7% white, 0.8% black or African American, 0.3% Asian, 0.2% American Indian, 2.6% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 5.3% of the population.[19] In terms of ancestry, 36.5% were German, 14.1% were Irish, 12.2% were American, and 10.1% were English.[20]

Of the 11,956 households, 30.2% had children under the age of 18 living with them, 54.7% were married couples living together, 9.3% had a female householder with no husband present, 31.6% were non-families, and 27.2% of all households were made up of individuals. The average household size was 2.45 and the average family size was 2.95. The median age was 43.4 years.[19]

The median income for a household in the county was $47,323 and the median income for a family was $56,541. Males had a median income of $43,416 versus $27,908 for females. The per capita income for the county was $23,400. About 8.2% of families and 10.0% of the population were below the poverty line, including 14.1% of those under age 18 and 7.8% of those age 65 or over.[21]

As a historically Yankee rural county, Iroquois County has always been powerfully Republican. Although the county normally voted Democratic in Second Party System-era elections, since Iroquois County was reduced to its current borders by the creation of Kanakee County it has voted Republican in all, bar three, Presidential elections. The first of these was when the Republican Party was mortally divided between Progressive former President Theodore Roosevelt and conservative incumbent President William Howard Taft, and Roosevelt carried Iroquois County in a three-way race. The other two cases – the only times Iroquois County has voted Democratic – were in Franklin D. Roosevelt’s 1932 and 1936 landslides during the Great Depression.

Throughout the rest of its history, Iroquois County has been among the most solidly Republican counties in Illinois. Indeed, since 1940 only Lyndon Johnson in his 1964 landslide has garnered forty percent of the county’s vote for the Democratic Party, and only Bill Clinton in 1996 has topped 35 percent since 1968.

Republicans have also dominated at the local level with the Democratic Party only holding the office of Iroquois County Sheriff from 1974 until 2002 in the entirety of the history of the county.[24][25][26]